Pressure roller for film handling apparatus



July 6, 1937. FREESE 2,085,904

PRESSURE ROLLER FOR FILM HANDLING APPARATUS Filed Aug. 6, 1935 Fig. 3

INVENTOR HERMAN/V F/Fffdf ATTORNEY Patented July 6, 1937 UNITED STATESPRESSURE ROLLER FOR FILM HANDLING APPARATUS Hermann Freesc,Berlin-Reinickendorf, Germany,

assignor to Kiangfilm G. m. b. H., Berlin, Germany, a corporation ofGermany Application August 6, 1935, Serial No. 34,877 In GermanyFebruary 10, 1934 1 Claim.

This invention relates to film handling apparatus such as sound motionpicture recorders or reproducers, and has for its principal object theprovision of an improved means for controlling the operation of apressure roller which functions tomaintain the film in contact with thesprocket wheel.

In apparatus for the recording, reproduction or printing of films, guideor presser rolls adapted to be lifted away on hinges or pivots are knownin the art. Such rollers are provided for the purpose of preventing thefilm strip from jumping out of the teeth of the sprocket wheel, and theyare pressed against a stop subject to spring pressure. When hinged away,the swivel lever of this roll also bears on a stop subject to thepressure exerted by a spring. The presser rolls under operatingcondition press the film strip, for instance, against a stationary glidepath or a revolving toothless roller, and when hinged away they alsocome to be supported yieldingly against a stop.

The invention is concerned with an arrangement of the springs associatedwith rollers of the said sort, the outstanding feature of the disclosurebeing that the pivots of the hinged rollers are relieved of all springpressure.

The invention will be better understood from the following descriptionwhen considered in connection with the accompanying drawing and itsscope will be pointed out in the appended claim.

Referring to the drawing,

Fig. 1 illustrates difi'erent positions of the pressure roller, and

Figs. 2 and 3 illustrate various details of its support.

Before going into details of an exemplified embodiment of thisinvention, the arrangement of the guide rollers as known in the priorart shall again be briefly explained by reference to Fig. 1. I denotesthe film strip, II is a sprocket wheel. The guide roll I2 when in itsworking position bears against stop or rest- I3, while when hinged offas indicated by the broken lines An exemplified embodiment according tothe 6 invention of a spring arrangement in the rocker point or fulcrumI6 of the rocker lever I is illustrated in Fig. 2. As shown in thedrawing, two holes I! and I8 are formed in the fulcrum or pivot I6,while two other holes are formed at 10 I 9 and! inthe rocker lever I5.Engaged in the two holes I! and I9 and in holes I8 and are thebeginnings and the ends of two springs 2|, 22; the ends of these aresubstantially parallel, and parallel substantially-to the median line 16of the rocker fulcrum I6. These springs are shown separately inelevation in Fig. 3. The forces which are brought to act, for example,by the spring 2| upon the rocker fulcrum or pivot l6 and the rockerlever l5 comprise a radial and 20 a tangential component. The lattercomponent furnishes the requisite bear'mg pressure against the stops I3and I4, while the radial component, in the case mentioned, isneutralized by the oppositely directed radial component of the spring 2522. When the rocker I5 is turned, the spring 22 comes to occupy theposition 22' indicated by the broken lines, with the result that thetangential component is caused to reverse its direction so that therequisite bearing pressures against the stops I3 and II are produced.

I claim:

In combination, a sprocket, a pressure roller adapted to cooperatetherewith, an arm movably supporting said pressure roller, a'pivot forsaid arm and a spiral spring normally compressed in a non-radialdirection between said pivot and said arm for maintaining said rollereither in cooperative relation with said sprocket or away therefrom, thesaid spring having straight ex- 40 tensions at its ends extending intoholes in said pivot and said arm parallel with the axis of rotation.

HERMANN FREESE.

